【1】7分之3×4分之1÷4分之3 =3/7*1/4*4/3 =1/7 【2】5分之7×3分之2+15分之14除以9分之1 =7/5*2/3+14/15*9 =14/15*(1+9) =14/15*10 =28/3 要采纳最先回答的正确答案,是对答题者劳动的尊重.祝进步!
